Hello,
Psoriasis is considered
autoimmune disease with genetic base.
Hyperpigmentation is postinflammatory, it may go away by itself , do not worry, but may take time. Psoriasis is controlable disease. It may reccure again, but If precipitating factors are avoided, it may remain inactive.
To keep the psoriasis silent, ,,,
Keep the skin moist.
Avoid
stress.
Avoid alcohol.
Avoid certain drugs which precipitate psoriasis.
Take good sleep.
Avoid injuries,friction to skin, harmful chemicals....
Continue drugs like methotraxate in low dose .. 15 mg weekly in devided dose even after control of disease.
Your child may get psoriasis , as there is genetic base., not certainly.
Thyroid dysfuction has no direct effect on psoriasis pathogenesis. Coincidentally both the diseases may occur.
OK... Hope you get expected answers. Thanks
Dr. Ilyas Patel