Dermatitis is caused by different things based on your symptoms. But if you have a skin rash that won’t go away, you need to visit your healthcare provider. If your doctor suspects you with allergic contact dermatitis, then your doctor will perform patch tests as mentioned before. In this situation, you need to mention all products that get in contact with your skin. You need to avoid substances that you suspect to check whether the rash goes away. Keep in mind that your doctor will suggest UV treatment for dermatitis with severe symptoms.