Seroma after hair transplant (Photo)

Hi after 15 months, at the hairline, there is still big swallow but this swallow is under the skin and cannot be seen, but i always feel it and when i tried to touch it, it irretated quickly and painful recently it is become so red like an injury under the skin Can this be seroma or this is ridging? And what is the treatment ? My doctor run from his responsibiliy and said he does not know and he is (ishrs/ eshrs)