Irregular Pigmentation Home A-Z Health Information Health Library A-Z Irregular Pigmentation Overview Pigmentation involves skin darkening caused by excessive melanin production. Types Hypopigmentation: It is marked by a lighter skin tone in the affected area.Hyperpigmentation: It is marked by a darker skin tone in the affected area. Symptoms Dark or lighter patches or spots on the skin. Causes Sun exposureHormonal changesCertain diseasesInflammation Diagnosis Skin examination and medical history by a dermatologist. Treatment Topical agentsChemical peelsLaser therapyPRP therapy, depending on the condition and underlying cause Disclaimer: The information in this Health Library is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional with any questions about a medical condition or before starting any treatment. Use of this site and its content does not establish a doctor–patient relationship. In case of a medical emergency, call your local emergency number or visit the nearest emergency facility immediately.