Dr. William Ting, Board-Certified Dermatologist
at California Dermatology Care
2262 Camino Ramon, San Ramon, CA 94583
500 Alfred Nobel Drive, Suite #185, Hercules, CA 94547
Tel: 925-328-0255
Email: staff@CalDermCare.com
Prescription concerns: medical.assistant@CalDermCare.com

Advanced Care with a Personal Touch




Skin Allergy Patch Test

Patient Online Log in
(Instruction for Creating Acct)


Acne and Acne Scar

Excimer Laser for Psoriasis & Vitiligo

Keloid & Hypertrophic Scar Laser Therapy

Mohs Surgery for Skin Cancers

Nail Fungus GenesisPlus Laser Therapy

Photodynamic Therapy

Psoriasis & NBUVB Phototherapy

Radiotherapy Nonsurgical SRT for Skin Cancer and Keloid 

Skin Allergy Patch Test

Sweating Disorder MiraDry for Hyperhidrosis

Wart Laser Therapy

Women's Wellness Center


Aesthetician Services

Botox, Dysport & Xeomin

Cellfina Cellulite Therapy

CoolSculpting (dual-Sculpt and CoolAdvantage available)

Facial Redness/Vein Laser Therapy

Fillers injection for Wrinkles

Fractional CO2 laser

INFINI Microneedling RF

Laser Surgery Services
Acne/Pore reducing Laser
Collagen Stimulating Laser
Excimer Laser
Facial Veins laser
Hair Laser Removal
IPL Fotofacial
Melasma Laser
Nail Fungus Laser
Resurfacing Laser
Scar revision Laser
Tattoo Removal Lasers
VBeam Pulse Dye Laser
Wart Laser


Leg Vein Laser Therapy & Asclera Sclerotherapy

Liposonix + Vaser Shape Nonsurgical Body Sculpting

Melasma and Pigmentation

Pore Size Reduction and Laser Rejuvenation

PRP for Hair Loss and Rejuvenation

Sculptra and Voluma Liquid Facelift

Ulthera natural lift & skin tightening of face and neck

Vlase for Feminine Dryness, Atrophy, Stress-induced incontinence 

Women's Wellness Center

Related Websites

Email Staff at California Dermatology Care



* Review Dr. Ting's 727+ Q&A on RealSelf

Allergic contact dermatitis is responsible for approximately half of all contact dermatitis cases. Patients with persistent, unresolved contact dermatitis can suffer for years with a diminished quality of life and increased medical treatment costs. However, the condition can be effectively treated once an accurate diagnosis is obtained.

Dr. William Ting is a recognized local thought leader in skin allergy patch testing. He is a member of the American Contact Dermatitis Society. He utilizes North American Contact Dermatitis Group (NACDG) Standard 70 allergens. Additional allergens (such as suspected skin care products) may be tested upon request.

Patch testing is a simple procedure to help diagnose allergic contact dermatitis and identify the causative agent(s). The ultimate goal is to assist patients suffering from dermatitis to become better informed consumers and be cognizant of potential allergic contact triggers of the rash.

Patch test consists of panels of a wide variety of different allergens including fragrance, preservatives, metals, rubber ingredients, and other chemicals that one may commonly encounter in the surrounding and household items. Patch test involves no pain and requires a visit in 2 days to removal patch test panels and usually another visit in one to few days afterwards to catch potential delayed reactions.

Patch test is different from skin prick allergy tests performed by allergists. Skin prick allergy tests are helpful for allergic rhinitis or asthma as they will help elucidate type I immediate-type hypersensitivity. However, skin prick allergy tests are rarely helpful for skin sensitivities as type IV delayed-type hypersensitivity is typically involved. Patch test is designed specifically to isolate potential delayed-type hypersensitivity from contact triggers which is most relevant for allergic contact dermatitis.

Food allergy is typically not relevant for skin rash and thus food allergy testing is often not necessary for skin eruptions, particularly for adults 18 years and older. For special circumstances and upon request, Dr. Ting may order bloodwork for food allergen panels via Quest Diagnostic Laboratories.