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What are these small pink bumps on my chest and stomach? - patch of bumps on stomach

Approximately 2 months, I noticed what looked like a piece of dry skin on the chest for the next two weeks, I kept an eye on him and sometimes put sunscreen on her. Has now become a rut. He is bigger and dark pink. It is a kind of light, surrounded by dry skin. More and more small bumps are pink, which is now in the abdomen and chest. What is fever?