An acute or chronic skin inflammation characterized by erythema, papules, vesicles, pustules, scales, crusts, scabs, and possibly itching, is known as

The symptoms you have listed are describing ECZEMA. There is no exact cause of this skin condition, however, it could possibly come from your genetics or your body's immune system overactive response to something irritating that came across it such as a type of food you eat. 

Let me know if you need anything else. 

                         - Dotz

The organic compound you're looking for is a nucleic acid.