Patch testing has achieved professional recognition and acceptance as a scientific tool in investigating allergic contact dermatitis, an inflamation of the skin developed by some people as a result of their contact with certain substances (allergens).
The advantage of patch testing for suspected allergic contact dermatitis is that the problem allergens can be identified and the patient's rash can be effectively treated.

There are two types of contact dermatitis:

• Reddening of the skin (either in patches or all over the body)
• Intermittent dry, scaly patches of skin
• Blisters that ooze
• Burning or itching which is usually intense without visible skin lesions
• Swelling in the eyes, face and genital area
• Hives
• Sun sensitivity
• Darkened, "leathery" and cracked skin

Irritant contact dermatitis symptoms include:

• Mild swelling of the skin
• Stiff, tight feeling skin
• Dry, cracking skin
• Blisters
• Painful ulcers on the skin

Symptoms vary depending upon the cause of dermatitis.

When to Patch Test

• When allergic contact dermatitis is suspected
• When there is evidence of a work related dermatitis
• When there is any "refractory" or unexplained eczema
• When there is exposure to causative substances (jewelry, fragrances, plants, medications, etc)