cyst swell boil blister carbuncle lump wen abscess growth sore tumour tumor vesicle bleb polyp nodule bag pouch sac saccule ganglion hydatid injury pustule furuncle canker ulcer pimple eruption ulceration whitlow blain inflammation papule spot gathering gumboil infection outgrowth wart stone blemish fester noma impostume bulla lesion soreness weal chafing burn welt wheal irritation blister wale bubo excrescence protuberance bump tumescence bulge protrusion hump pock contusion projection knob zit whelk bruise hickey node prominence tumefaction process blackhead knot corn whitehead ridge swell bunch intumescence wound abrasion jut cut overhang laceration comedo scrape enlargement acne distension graze papula ledge convexity eminence