dark patches on skin and allergic rash at the child elbows known as acanthosis nigricans look like a darkened velvet.

acanthosis allergic allergy asian background bad beauty black body care child chronic closeup coloured cubit cuticle damage dark darkened dermatitis dermatologist dermatology disease disorder dry dryness eczema elbow elbows female flaky health healthy joint known look medical medicine nigricans patches physical problem rash rough scleroderma skin sore spot surface texture toggle touching treatment unhealthy velvet woman worry wrinkle young