Dr. Arnon Moshe Katz – Dermatologist | Newmarket, ON

Dr. Arnon Moshe Katz is a dedicated Dermatologist specializing in the diagnosis and treatment of a wide array of conditions affecting the skin, hair, and nails in adult patients, and may see older children for certain conditions. Practicing at Toronto Western Hospital in Newmarket, ON, he is a key member of the local medical community. He provides comprehensive medical and surgical dermatological care for a broad spectrum of skin, hair, and nail conditions, including acne, eczema, psoriasis, and skin cancer detection. His approach emphasizes evidence-based medicine, ensuring patients receive the most current and effective treatments in a comfortable and professional environment.

Dr. Katz graduated with a Medical Degree from the University of Toronto in Canada and has over 32 years of experience practicing as a Dermatologist since 1992. He is recognized as a RCPSC Specialist by the College of Physicians and Surgeons of Ontario (CPSO), holding license number 58300. His extensive training and experience enable him to deliver expert care across a wide range of dermatological issues, combining clinical expertise with compassionate patient engagement.

Guided by a commitment to evidence-based skin care, Dr. Katz emphasizes patient education on skin health and prevention, early detection of skin cancers, and personalized treatment plans tailored to each individual's needs. He is dedicated to serving the community of Newmarket, providing care in English, and ensuring that every patient understands their condition and available treatment options. His practice aims to promote optimal skin health and improve quality of life for all patients he serves.

Dr. Arnon Katz diagnoses and treats a wide range of skin, hair, and nail conditions, including:

Hair & Scalp Disorders

• Telogen Effluvium: A type of temporary, diffuse hair shedding often triggered by significant stress, illness, surgery, nutritional deficiencies, or hormonal changes (e.g., postpartum).
• Traction Alopecia: Hair loss caused by prolonged or repetitive tension on the hair follicles, often due to tight hairstyles (braids, ponytails, extensions).
• Alopecia Areata (Patchy, Totalis, Universalis, Ophiasis): An autoimmune disorder causing hair to fall out, often in round patches. Can affect scalp, beard, eyebrows, eyelashes, or entire body.

Acne, Rosacea & Follicular Disorders

• Keratosis Pilaris: A common, harmless condition causing small, rough bumps on the skin, usually on the upper arms, thighs, cheeks, or buttocks, due to keratin buildup in hair follicles.
• Acne Scars (Atrophic, Hypertrophic, Keloidal): Permanent textural changes and indentations (atrophic), raised scars (hypertrophic), or overgrown scars (keloidal) that can result from severe or picked acne.
• Hidradenitis Suppurativa (Acne Inversa): A chronic, recurrent inflammatory skin condition featuring painful, deep-seated lumps, abscesses, sinus tracts, and scarring, typically in areas where skin rubs together (axillae, groin, under breasts).

Skin Cancers, Precancerous Lesions & Benign Growths

• Melanoma: The most serious type of skin cancer, developing in melanocytes. Early detection is crucial. Look for asymmetry, irregular borders, color variation, diameter >6mm, and evolving moles (ABCDEs).
• Basal Cell Carcinoma (BCC): The most common type of skin cancer, typically slow-growing and arising from sun-exposed skin, appearing as a pearly or waxy bump, flat flesh-colored or brown scar-like lesion, or a bleeding/scabbing sore.
• Skin Cysts (Epidermoid, Pilar, Sebaceous): Benign, sac-like growths under the skin containing fluid or semi-solid material. May become inflamed or infected and sometimes require removal.

This list is not exhaustive. For personalized advice regarding your specific dermatological condition, please consult with Dr. Arnon Katz.

• Phototherapy (Narrowband UVB, Broadband UVB, PUVA, Excimer Laser): Controlled administration of specific wavelengths of ultraviolet light to treat various skin conditions such as psoriasis, eczema, vitiligo, and cutaneous T-cell lymphoma.
• Psoriasis & Psoriatic Arthritis Management (Topical, Phototherapy, Systemic, Biologics, JAK inhibitors): Comprehensive management of psoriasis (plaque, guttate, pustular, erythrodermic) and associated psoriatic arthritis, using topical treatments, narrowband UVB or PUVA phototherapy, oral systemic medications (e.g., methotrexate, cyclosporine), and advanced biologic therapies or JAK inhibitors targeting specific immune pathways.
• Hidradenitis Suppurativa Management (Medical, Interventional, Biologics): Medical (antibiotics, retinoids), interventional (incision & drainage, deroofing), and biologic therapy for a chronic inflammatory skin condition causing painful lumps, abscesses, and sinus tracts in skin folds.
• Excision of Benign Lesions (Moles/Nevi, Cysts, Lipomas, Skin Tags, Seborrheic Keratoses): Surgical removal of non-cancerous skin growths for medical reasons (e.g., irritation, inflammation) or cosmetic purposes, with pathological examination if indicated.
• Microneedling (Collagen Induction Therapy) & Radiofrequency (RF) Microneedling): Procedures that create controlled micro-injuries in the skin to stimulate collagen and elastin production, improving skin texture, reducing scars (acne, surgical), fine lines, and stretch marks. RF Microneedling combines microneedling with radiofrequency energy for enhanced skin tightening and rejuvenation.
• Medical-Grade Facials & Skincare Consultations: Professional facial treatments tailored to specific skin concerns and expert advice on developing an optimal at-home skincare regimen using medical-grade products.
• Skin Biopsy (Punch, Shave, Excisional, Incisional): Obtaining a small sample of skin under local anesthesia for microscopic examination to diagnose various skin conditions, including infections, inflammatory disorders, and skin cancer. Techniques are chosen based on the suspected condition and lesion characteristics.

Note: This list provides a general overview of medical and potentially some cosmetic services. Treatment plans are highly individualized. Discuss with Dr. Katz for care relevant to your specific condition. Coverage for services varies; medically necessary treatments are typically covered by provincial health plans, while cosmetic procedures are usually self-pay.

All medical and surgical services (if applicable) are provided in accordance with the standards of practice set by the College of Physicians and Surgeons of Ontario (CPSO) and relevant dermatological care guidelines. Contact the clinic or your referring physician regarding new patient intake and referral processes.

Toronto Western Hospital's dermatology unit in Newmarket is situated in the Central Newmarket, Gorham-College Manor neighborhood, serving as a vital medical facility within the hospital complex. The clinic is conveniently accessible from the Tannery Mall area, a well-known local landmark. Patients can reach the practice via public transit, with services provided by York Region Transit (YRT) / Viva, ensuring ease of access for commuters. The facility is wheelchair accessible, accommodating patients with mobility needs. Parking is available at or near the facility, providing convenient options for those arriving by car. This location functions as a specialized dermatology unit within the hospital, dedicated to providing expert skin care in a setting equipped with modern diagnostic and therapeutic tools.

Are consultations and dermatological treatments with Dr. Katz, a Dermatologist, covered by Ontario Health Insurance Plan (OHIP) in ON?

Medically necessary consultations with a licensed Dermatologist like Dr. Katz, diagnostic procedures (e.g., skin biopsies), and treatments for provincially insured skin conditions (e.g., psoriasis, severe eczema, skin cancer, infections) are generally covered by Ontario Health Insurance Plan (OHIP) in ON when a referral from a family doctor is in place. Purely cosmetic procedures (e.g., Botox for wrinkles, most laser hair removal, fillers for aesthetic enhancement) are typically not covered and are self-pay. It's crucial to discuss coverage specifics for any proposed treatment with Dr. Katz's office or Ontario Health Insurance Plan (OHIP) beforehand, especially if there's a potential cosmetic component.

Do I need a referral to see Dr. Katz, a Dermatologist?

Yes, for medically necessary dermatological care covered by the provincial health plan, a referral from your family physician or another specialist (e.g., an ER doctor for an acute issue) is almost always required to see a Dermatologist such as Dr. Katz. This ensures coordinated care and that your visit is appropriate for specialist assessment. Some dermatologists may offer consultations for uninsured cosmetic services without a referral, but these would be a direct cost to you. Always check with the clinic regarding their specific referral policy.

What are some common medical procedures a Dermatologist like Dr. Katz performs?

Dermatologists like Dr. Katz perform a variety of diagnostic and therapeutic procedures. Common medical procedures include skin biopsies (punch, shave, or excisional) to diagnose conditions, cryosurgery (freezing with liquid nitrogen) for warts or precancerous spots (actinic keratoses), surgical excision of skin cancers or benign lesions like cysts and atypical moles, intralesional injections (e.g., for keloids or alopecia areata), and prescribing specialized topical or oral medications (including biologics or immunosuppressants for complex conditions). Many dermatologists also offer phototherapy. Dr. Katz can discuss specific procedures relevant to your condition and may have subspecialty interests influencing the range of procedures offered.

Dr. Katz mentioned biologics. What are they for skin conditions?

Biologic medications are a newer class of treatments for moderate to severe inflammatory skin conditions like psoriasis, eczema (atopic dermatitis), and hidradenitis suppurativa, when other treatments haven't been effective enough. Unlike traditional systemic drugs that suppress the broader immune system, biologics are proteins engineered to target very specific parts of the immune system that cause inflammation in these diseases. They are usually given by injection (either by Dr. Katz's office or self-administered at home) or intravenous (IV) infusion. Dr. Katz would discuss the specific biologic, its benefits, potential side effects, and monitoring requirements if it's a suitable option for you.

Toronto Western Hospital
531 Davis Drive, Krembil Research Institute
Newmarket, ON L3Y 6P5

Phone: (905) 836-1454 | Fax: (905) 836-1585

The facility is wheelchair accessible.

Dr. Katz is a licensed Dermatologist regulated by the College of Physicians and Surgeons of Ontario (CPSO) under the Regulated Health Professions Act, 1991 and Medicine Act, 1991 in ON. A referral from a family physician is typically required for consultations with Dr. Katz for medically necessary services covered by the provincial health plan. Cosmetic consultations may have different requirements.

Verify registration with the College of Physicians and Surgeons of Ontario (CPSO): https://doctors.cpso.on.ca/DoctorDetails/Katz-Arnon-Moshe/0044322-58300