Common Skin Conditions & Effects Skin conditions are the fourth most common cause of human illness! https://onlinelibrary.wiley.com/doi/full/10.1111/jdv.15494Despite this, many affected people do not seek medical treatment. Therefore the true prevalence is underreported.Common types of skin conditions: Psoriasis Eczema Burns Dry Skin Dermatitis Fungal Acne Hives Rosacea Shingles