what causes bumps on your scalp
Possible Causes. Bumps on the scalp can be caused by a skin condition called seborrheic dermatitis. According to the MedlinePlus website, this illness occurs due to the yeast malassezia and an excess production of oil on the skin. Triggers may include stress, infrequent bathing, alcohol-containing lotions and obesity.
Around a third of all people with psoriasis also have a close relative with the same condition. You increase your chances of scalp psoriasis further if your have a medical history of HIV or strep throat. Finally, obesity, smoking, and stress increase your chances of developing bumps on the scalp due to psoriasis.