Hi, i would really like your judgement on whether or not the spots on the hull of this boat, reveals a case of osmosis?

I just bought this one, a Hurley 22 from 1971, despite a lack of thorough knowledge on boats. I have talked to several knowledgeable and helpful people, who states it to be in fairly good condition. From the outside it certainly does not show any hints of osmosis, but then i look at this picture and get nervous. I havent heard of cases in which it could be identified from the inside despite looking healthy on the outside, but i cant help thinking that the spots on the very left of this photo kind of looks like osmosis.

What do you think?

Best regards, Martin