Nail pitting with no other symptoms is getting a little bit better in some nails (no psoriasis,bald patches..). would it be likely to be aa?

Alopecia areata: It is possible it may be alopecia areata, sarcoidosis, or a connective tissue disease or other causes of skin inflammation in general if all nails are affected. Time to check with a dermatologist who can treat the bald patches and make sure there is no fungal or tension or alternative cause.

Not necessarily: The differential diagnosis is fairly long - it includes several nutritional deficiencies -calcium, protein, iron, vitamins, several diseases such as psoriasis, Reiter's Disease, chronic dermatitis, lichen planus, as well as alopecia areata, which can have a characteristic pattern. See your doctor to narrow down the possibilities