If it's hard to determine its shape and otherwise looks like a big blob of something, it's probably safe to call it a lump.

Jabba the Hut looks like a disgusting lump. So does the growing mound on your noggin where you walked into the glass door. And if you've been lumped together with a bad bunch, you might have been grouped with people indiscriminately. But all lumps aren't bad. Little old ladies put lumps of sugar into their tea. And that choked up feeling you get during a sappy movie? That's just a lump in your throat.

Definitions of lump
  1. noun
    a compact mass
    synonyms: ball, chunk, clod, clump, glob
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    clot, coagulum
    a lump of material formed from the content of a liquid
    a lump of slimy stuff
    a ball of yarn or cord or thread
    a blood clot formed within a blood vessel and remaining attached to its place of origin
    an abnormal particle (e.g. an air bubble or part of a clot) circulating in the blood
    type of:
    a jumbled collection or mass
  2. noun
    an abnormal protuberance or localized enlargement
    synonyms: puffiness, swelling
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    a swelling on the epididymis or the testis; usually contains spermatozoa
    swelling of the rumen or intestinal tract of domestic animals caused by excessive gas
    a painful swelling of the bursa of the first joint of the big toe
    dropsy, edema, hydrops, oedema
    swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities
    haematocele, haematocoele, hematocele, hematocoele
    swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis)
    intumescence, intumescency
    swelling up with blood or other fluids (as with congestion)
    swelling of the iris of the eye
    swelling of a lymph node
    oscheocele, oscheocoele
    swelling of the scrotum
    tumidity, tumidness
    slight swelling of an organ or part
    Quincke's edema, angioedema, atrophedema, giant hives, periodic edema
    recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs
    swelling (usually in the legs) caused by lymph accumulating in the tissues in the affected areas
    a skin disease marked by hard edema of the tissue usually beginning in the face
    cystoid macular edema
    a specific pattern of swelling in the central retina
    generalized edema with accumulation of serum in subcutaneous connective tissue
    edema of the mucous membrane of the eyeball and eyelid lining
    swelling of the optic disc (where the optic nerve enters the eyeball); usually associated with an increase in intraocular pressure
    brain edema, cerebral edema
    swelling of the brain due to the uptake of water in the neuropile and white matter
    tumidity resulting from the presence of blood or other fluid in the tissues
    haematoma, hematoma
    a localized swelling filled with blood
    type of:
    (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
    the state of being enlarged
  3. noun
    a large piece of something without definite shape
    “a lump of coal”
    synonyms: hunk
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    (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)
    a solid lump of a precious metal (especially gold) as found in the earth
    (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals
    type of:
    part, piece
    a portion of a natural object
  4. verb
    put together indiscriminately
    lump together all the applicants”
    synonyms: chunk
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    type of:
    accumulate, amass, collect, compile, hoard, pile up, roll up
    get or gather together
  5. verb
    group or chunk together in a certain order or place side by side
    synonyms: chunk, collocate
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    type of:
    arrange into a group or groups
  6. noun
    an awkward, foolish person
    synonyms: clod, gawk, goon, lout, lubber, lummox, nimrod, oaf, stumblebum
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    type of:
    clumsy person
    a person with poor motor coordination
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