Thanks for the query. Based on your description it looks like a superficial bacterial infection usually caused by staphylococcus aureus. Sometimes they co-exist with fungal folliculitis. Kindly consult a dermatologist for exact diagnosis and a precise treatment plan. Its also important to prevent their relapse once you have got it cured. A decolonization regimen suggested by your doctor will help. The first episode could have been the hair dye contact allergy. In future use a hair dye with a component called ppd.   Best wishes Dr MK Agarwala