Melasma is a pigmentary disorder presenting as symmetrical brownish patches commonly seen on the cheeks, forehead, nose bridge, and upper lip. It predominantly affects women especially during hormonal fluctuations like pregnancy or contraceptive use but also men occasionally suffer from it too.

• This condition arises due to increased melanin production triggered by UV exposure combined with genetic predisposition.
  
• A dermatologist diagnoses melasma clinically supported by tools like Wood's lamp examination which highlights pigmentation depth.
  
• Treatments focus on sun protection measures alongside topical agents such as hydroquinone, azelaic acid or tretinoin designed to lighten affected areas gradually.
  
• Chemical peels or laser therapy may be options under specialist supervision if conventional treatments prove insufficient.
  
• An ongoing commitment to maintenance prevents relapse since melasma tends toward chronicity once established.
  

This discoloration has no systemic health impact but managing cosmetic concerns effectively enhances patient's confidence significantly over time.

Seborrheic dermatitis is a common inflammatory disorder predominantly affecting areas rich in sebaceous glands like the scalp (dandruff), face, and upper chest. It presents with flaky scales and redness due to yeast overgrowth combined with immune response disturbances.

• The condition causes greasy scales paired with erythema that can be itchy but usually mild discomfort only.
• The diagnosis is clinical; laboratory testing is not generally required unless atypical signs raise suspicion for other conditions.
• Treatment includes antifungal shampoos containing ketoconazole or selenium sulfide along with mild topical corticosteroids during flares for relief.
  

This chronic inflammatory skin disorder leads to itchy, red patches that often affect children but may continue into adulthood. It results from a combination of genetic and environmental factors causing a defective skin barrier.

• Symptoms consist of dry skin, intense itchiness, redness, and sometimes crusting or oozing lesions.
• The disease is diagnosed mainly through clinical examination and patient history including family allergy tendencies.
• Treatment focuses on moisturizing regularly, using topical corticosteroids or calcineurin inhibitors to reduce inflammation.
• Avoiding triggers such as irritants or allergens plays an important role in flare prevention.

Lifelong management strategies improve quality of life significantly by controlling symptoms and preventing secondary infections.