Toenail detached from nail bed. Saw 2 dermatologists already

Toenail detached from nail bed. Saw 2 dermatologists already but with different diagnoses. 1st derma diagnosed it as trauma since my fungal culture sensitivity test came out negative. 2nd derma diagnosed it as fungal infection even if I told her about the negative fungal test. Just wanted to ask your opinion on my toenail condition? Could it be fungus, trauma or psoriasis?