Pityriasis is a skin condition characterized by flaking or scaling of the skin. It is also commonly referred to as seborrheic dermatitis or dandruff. Other synonyms for pityriasis include psoriasis, tinea versicolor, and eczema. Psoriasis is a chronic autoimmune condition that causes red, scaly patches on the skin. Tinea versicolor is a fungal infection that typically affects the chest, back, and shoulders. Eczema, also known as atopic dermatitis, causes itchy and inflamed patches of skin. While all these conditions have similar symptoms to pityriasis, they are caused by different factors and require different treatments. Consulting with a dermatologist is essential for proper diagnosis and effective treatment.