What is Patch Testing?
A specialized form of testing in dermatology that evaluates if substances that come into direct contact with skin may cause a delayed allergic reaction. This is different from allergy testing provided by an allergist that evaluates which inhaled or ingested substances may cause an immediate allergic reaction such as hives, swelling or anaphylaxis.
How to Prepare for your Appointment
Similar to other doctors’ visits, you will be asked a series of questions to help us determine the source of your dermatitis. Here are some key pieces of information that you may be asked at your initial consultation:
Current History
- Date of onset of rash
- Body site most affected by rash
- Description of rash including symptoms (burning, itching, pain)
- Current skin medications
- Previous skin treatment
Past History
- Previous skin diseases
- Other health related issues
- Current non-skin medications
Allergic History
- Previous diagnoses of asthma, hay fever, or eczema
- Previous reactions to products applied to the skin
- Other allergies
- Family history of asthma, hay fever, or eczema
Personal Habits
- Handwashing—Frequency and type of soap
- Bathing—Frequency and type of soap
- Face or Body lotion application
- Facial Makeup application (foundation, eye products, lip products, etc)
- Cologne or perfume use
- Sunscreen use
- Hair Products (shampoo, conditioner, mousse, hairspray, etc)
- Hair dye or bleaching—frequency and type
- Nail Cosmetics
- Hobbies
Occupational History
- Current Occupation
- Chemicals exposed to at workplace
- Gloves used for work
- Relation of dermatitis to the workplace setting (i.e. when away from work, skin improves; when returning to work, skin worsens)