You think an ingested substance has damaged the lining of your mouth or digestive tract.Ĭontact dermatitis is caused by exposure to a substance that irritates your skin or triggers an allergic reaction.Your eyes or nasal passages hurt after inhaling smoke from burning poison ivy.It's hard to breathe after inhaling burning weeds.Clues include fever and pus oozing from blisters. Seek immediate medical care in the following situations: The rash involves the eyes, mouth, face or genitals.The rash doesn't get better within three weeks.You're worried about how your rash looks.The rash is so itchy that you can't sleep or go about your day.Bumps and blisters, sometimes with oozing and crusting.Dry, cracked, scaly skin, typically on white skin.Leathery patches that are darker than usual (hyperpigmented), typically on brown or Black skin.Signs and symptoms of contact dermatitis vary widely and may include: The rash can develop within minutes to hours of exposure, and it can last 2 to 4 weeks.

For example, the rash may show up along a leg that brushed against poison ivy. Here, the blisters are caused by contact with the oily substance in poison ivy (urushiol) that causes allergic reactions.Ĭontact dermatitis shows up on skin that has been directly exposed to the substance causing the reaction.

Skin pronlems with blisters that weep