Skin conditions can come due to infections or toxic reactions. This has 2 issues. One is the skin issue and another is the cosmetic aspect. Reasons could be microbial infection, food poisoning or exposure to other toxic substances. The biggest, most prevalent challenge is psoriasis and its reasons have not been identified. There are certain studies which prove that industrialization and over exposure to chemicals cause psoriasis. People working in industrial areas are prone to most chronic skin conditions. But one thing is for sure, improper lifestyle and stress aggravates it.