Seborrheic dermatitishttps://en.wikipedia.org/wiki/Seborrhoeic_dermatitis
Seborrheic dermatitis is a chronic skin disorder. Symptoms include red, scaly, greasy, itchy, and inflamed skin. Areas of the skin rich in oil-producing glands are often affected including the scalp, face, and chest. In babies, when the scalp is primarily involved. Dandruff is a milder form of the condition without inflammation. Seborrheic dermatitis is not contagious.

The typical treatment is antifungal cream and anti-inflammatory agents. Specifically, ketoconazole or ciclopirox are effective.

The condition is most common in infants within the 3 first months or in adults aged 30 to 70 years. In adults between 1% and 10% of people are affected. Males are more often affected than females.

○ Treatment ― OTC Drugs
It tends to get worse when it's hard and stressful. Take a break and use an anti-dandruff shampoo daily.
#Ciclopirox shampoo
#Ketoconazole shampoo
#Fluocinolone shampoo
#Pyrithione zinc shampoo
#Selenium sulfide shampoo

Apply topical OTC steroids only to the itchy areas for a short time. Be aware that applying too much steroid to the skin can cause a side-effect such as folliculitis.
#Hydrocortisone cream
  • It occurs between the nose and mouth, and the side of the nose and glabellar area are also common areas.
  • Seborrheic dermatitis on the scalp
  • Acute form of Seborrheic dermatitis on the scalp
  • The scalp and border of the scalp are common sites of Seborrheic dermatitis.
  • Infant 2 months old. It is a common disease observed in newborns.
References Diagnosis and Treatment of Seborrheic Dermatitis 25822272
Seborrheic dermatitis is a common skin condition that affects people of all ages, from babies to adults. Its main symptoms include flaking, redness, and itching, usually appearing on the scalp, face, chest, back, underarms, and groin. Doctors typically diagnose it based on where and how the skin looks. This condition is believed to occur when the skin reacts to a yeast called Malassezia by becoming inflamed. The primary treatment involves using antifungal medications like ketoconazole applied to the affected areas. However, because these medications can sometimes have side effects, doctors recommend using anti-inflammatory treatments like corticosteroids and calcineurin inhibitors only for short periods. There are also many over-the-counter shampoos available for treating scalp seborrheic dermatitis, which patients are often advised to start with. If these don't work, doctors may suggest using antifungal shampoos for a longer duration or short-term corticosteroids for stubborn scalp conditions.
 Seborrheic Dermatitis 31869171 
NIH
Seborrheic dermatitis (SD) is a common inflammatory skin disease presenting with a papulosquamous morphology in areas rich in sebaceous glands, particularly the scalp, face, and body folds. The infantile (ISD) and adult (ASD) variants reflect the condition’s bimodal occurrence. Infants are not usually troubled by seborrheic dermatitis, but it may cause significant parental anxiety, often appearing as firm, greasy scales on the crown and frontal regions of the scalp. It occurs in the first three months of life and is mild,self-limiting, and resolving spontaneously in most cases by the first year of life. ASD, on the other hand, is characterized by a relapsing and remitting pattern of disease and is ranked third behind atopic and contact dermatitis for its potential to impair the quality of life.