I had a painful cystic acne on my shoulders around 2 months back, which has already deflated by now. However, currently the area still appears bruised, and hurts if pressure is applied. When I press down on it, I could feel a soft lump which rolls about. Is that the remaining pus/blood in the cystic acne? Do I wait out for it to heal on its own, or visit a GP or a polyclinic for a drainage? Since it only hurts when pressure is applied, it does not irritate me much except for its unsightliness.