(n.) A large vesicle or bulla, usually containing a serous fluid; a blister; a bubble, as in water, glass, etc.

abscess air bubble aposteme balloon bed sore bilge birthmark blackhead bladder blain blemish blister blob blood blister boil boss bow bubble bubo bulb bulge bulla bump bunch bunion burl button cahot canker canker sore carbuncle chancre chancroid check chilblain chine cicatrix clump cold sore comedo condyle convex crack crater craze defacement defect deformation deformity disfiguration disfigurement distortion dowel ear eschar fault felon fester festering fever blister fistula flange flap flaw freckle furuncle furunculus gall gathering globule gnarl gumboil handle hemangioma hemorrhoids hickey hill hump hunch jog joggle keloid kibe kink knob knot knur knurl lentigo lesion lip loop lump milium mole mountain needle scar nevus nub nubbin nubble papilloma papula papule paronychia parulis peg petechia piles pimple pit pock pockmark polyp port-wine mark port-wine stain pustule rib ridge rift ring rising scab scar scratch sebaceous cyst shoulder soap bubble soft chancre sore spine split stigma strawberry mark stud sty style suppuration swelling tab track tubercle tubercule twist ulcer ulceration verruca vesicle wale warp wart weal welt wen wheal whelk whitehead whitlow wound