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Yes, it is possible to regain hair after experiencing hair loss due to seborrheic dermatitis. The condition is primarily characterized by scalp inflammation and dandruff, which can lead to temporary hair loss. Here are some important points to consider:
Treatment Approaches

Medicated Shampoos

Using anti-fungal or medicated shampoos containing ingredients like ketoconazole, zinc pyrithione, or selenium sulfide can help manage seborrheic dermatitis. Regular use may alleviate inflammation and promote a healthier scalp.
Nourishing the Scalp

Keeping the scalp moisturized and free from excessive oil buildup is crucial. Natural oils, such as tea tree or coconut oil, can help maintain scalp health.
Consultation with a Healthcare Professional

If your symptoms persist, consulting a dermatologist is advisable. They can prescribe stronger treatments or investigate other contributing factors to your hair loss.
Factors Influencing Hair Regrowth

Severity of the Condition: If the dermatitis causes extensive inflammation and injury to hair follicles, regrowth may take longer.
Individual Response: Everyone's hair recovery can vary based on overall health, genetics, and the effectiveness of the treatment.
Hair regrowth may take time, but with proper care and treatment, many individuals can see improvements. Have you tried any specific treatments yet?

Taking biotin will help along with jello and beef or buffalo collegian.

Symptoms of Seborrheic Dermatitis
Also called seborrheic eczema, seborrheic dermatitis can occur with or without reddened skin. Seborrheic dermatitis is known as cradle cap in infants. Seborrheic dermatitis primarily affects the scalp, but it also can develop on other parts of the body.

Seborrheic dermatitis can be confused with other conditions, especially in young children. It is commonly mistaken for diaper rash and eczema.

It often forms where the skin is oily or greasy. Common areas include the scalp, eyebrows, eyelids, creases of the nose, lips, behind the ears, in the outer ear, and in the middle of the chest.2

In general, symptoms of seborrheic dermatitis include:

Skin lesions with scales
Plaques over a large area
Greasy, oily areas of skin
Skin scales, usually white and flaking or yellowish, oily, and sticky dandruff
Itching
Mild redness
How Does It Cause Hair Loss?
Hair loss is associated with seborrheic dermatitis because increased oil production can create irritation and inflammation on the scalp, leading to intense itchiness. Scratching the scalp can damage the hair follicles, which obstructs natural hair growth and causes your hair to fall out.

Hair loss from seborrheic dermatitis, though, is rare and usually reversible. It may occur, however, due to the growth of Malassezia yeast. This type of yeast can cause inflammation and further damage to hair follicles if a lot is produced and left untreated. Just like increased oil production, increased Malassezia production can cause hair loss.1

When to See a Doctor
If you notice symptoms of seborrheic dermatitis in yourself or your child, contact your doctor for evaluation and possible referral to a dermatologist.