Sore itchie , red bumps on head

Patient: Hi, i have red bumps that look like pimples on the back of my head, there red and starting to become itchie and sore, i dont jo if its because i didnt wahs my hair for a few days then washed it, but its near my ear and middle of my head on the left side, almost like a burning type feeling

Symptoms: Sore, itchie and red , burning type feeling