Original Article: http://www.mayoclinic.com/health/medical/IM02939
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- Slide show: Types of dermatitis
Atopic dermatitis can cause small, red bumps, which can be very itchy. When scratched, the bumps may leak fluid and crust over. Atopic dermatitis most often occurs where your skin flexes — inside the elbows, behind the knees and the front of the neck.