You have received a diagnosis of psoriasis.
It can affect your skin, nails and joints with propensity towards developing cardiometabolic diseases.
When there is nail involvement - it depends how many nails are involved before starting tteatment...it depends on it
Also, many cases of psoratic nails have associated onychomycosis that is fungal nail infection....it becomes necessary to treat it as it can aggravate your nail psoriasis by what we call as koebner phenomenan.
Next Steps
Donot worry...take a dermatology consult, get definitive diagnosis.
Health Tips
Tip - Get a test done -> KOH nail clipping for fungus to confirm it.
Good luck.