Pink rash on chest

Hi,

Lately I've been having this weird rash on my chest. I know before it comes, cause i notice my chest is itching. After the itching I look at my chest and see pink spots (max 1 cm diameter) on my chest. They might be raised, and sometimes not. The weird thing is, after they started itching, they stop itching, leaving only pink spots that fade after a day or two, sometimes leavind a small red raised "bump" (1mm). I've looked everywhere on internet, but can't find no pictures that are similar to my rash.

I don't have that much trouble for it, except for the first 5 minutes they itch, so I didnt see a need for a doctor. But lately they've been coming out more regularly, and I'm really puzzles what it could be.

Has anyone of you heard about something like this?

Thank you in advance!