Changes occur in the so-called seborrheic areas where sebaceous glands are most numerous. The occurrence of seborrhoea is primarily influenced by hereditary factors, then hormonal and above all emotional factors (stress) and individual nutritional factors (alcoholic drinks, spicy foods, etc.).
Increased secretion of sebum is also stimulated by some drugs such as corticosteroids, synthetic gestagen and tranquilizers, and it was also observed in patients with, for example, Parkinson’s disease. Seborrhoea is also a significant predisposing factor for the development of seborrheic dermatitis, acne vulgaris, rosacea and gram-negative folliculitis.