There are 39 conditions associated with excessive sweating and skin rash. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions.
Sunburn is often associated with a rash that begins as a small, pink patch on the skin or a mole-like spot than then start spreading out. The rash appear within 12 to 24 hours after exposure to UV rays and can be particularly worse if you are under certain medications such as Doxycycline.
1 Mild cases of sunburn lead to redness of the skin and pain. 2  A few hours after sun exposure, the skin may become irritated. The main effects of sunburn usually occur 12 to 24 hours after sun exposure.  Severe cases of sunburn are also described as sun poisoning.