It seems that you may be having seborrheic dermatitis
You are having dark greasy papular lesions in seborrheic areas.
Exact cause is not known.
It may bae due to stress
,worries and mental upsets,weather extremes,alcohol,some internal disease,fatigue
It may be due to overproduction of oil and irritation due to fungus like melassezia.
Diagnosis is based on location and appearance of the rash.
SD is chronic disease and controlled with treatment.
Psychological distress,bacterial and fungal infections are the complications.
You consult dermatologist
for perfect diagnosis and treatment.
I hope you got my answer.
Dr. Ilyas Patel MD