What would cause a red very itchy rash that appeared on your chest when you were out in the sun one week after getting sunburn?

There are a few possibilities for what could cause a red, itchy rash on your chest when you were out in the sun one week after getting sunburn. Here are a few possibilities:

- Sun poisoning: This is a severe sunburn that can cause blisters, fever, chills, nausea, and vomiting. If you suspect sun poisoning, seek medical attention immediately.

- Photoallergic reaction: This is a skin reaction that occurs when you are exposed to sunlight after coming into contact with a certain substance. These substances could include perfumes, sunscreens, or even some plants.

- Polymorphic light eruption (PMLE): This is a skin condition that is triggered by exposure to sunlight. It is characterized by itchy, red bumps that appear on sun-exposed areas of the skin.

- Tinea versicolor: This is a fungal infection of the skin that can cause white or brown spots to appear on sun-exposed areas of the skin. These spots can also be itchy and inflamed.

- Sebaceous hyperplasia: This is a condition that causes the oil glands on your skin to become enlarged and secrete more oil. This can lead to red, itchy bumps on your chest, especially if you spend time in the sun.