my dad has hiv/aids and has sores on his butt and underarm is this one of the symptoms of hiv/aids

Those may not be specificate symptoms but, infection with HIV/AIDS can weaken the immune system to the point that it has difficulty fighting off certain infections. These types of infections are known as "opportunistic" infections because they take the opportunity a weakened immune system gives to cause serious illness.

It's best he see a doctor for a correct diagnosis.

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