What does blotch mean?
A blotch is an irregular, usually unwelcome patch of discolouration on a surface—most often on human skin, where it suggests a rash or irritation, but equally on fruit, leaves, paintwork, or paper. As a verb, to blotch something is to cover it with such uneven marks, giving rise to the common adjective 'blotchy', used freely in everyday descriptions of complexion and weathered surfaces. The word carries a distinctly negative connotation: nobody praises a blotch, and the term appears frequently in medical, gardening, and art-restoration contexts alike, from sun-induced blotches on skin to fungal blotches on rose leaves. Its sound—short, blunt, ending in the same '-otch' as 'botch' and 'notch'—suits its meaning, evoking something messy and imprecise rather than neat or deliberate. For writers, 'blotch' offers a vivid alternative to the blander 'spot' or 'mark' whenever the discolouration is large, shapeless, and unattractive.
An irregular spot or patch of discolouration on a surface, especially on skin, fruit, or a painted or printed area.
"The doctor noted a purple blotch just below his collarbone."
Often used in the plural when describing rashes or widespread marking.
To mark or disfigure something with irregular spots or patches of discolouration.
"Water damage had blotched the ceiling above the window."
Standard regular plural; frequently used because blotches rarely appear singly.
"Red blotches appeared on her cheeks within minutes of exposure."
That angry red blotch on your skin and the word for it may have grown out of the same muddy 17th-century mixing of 'blot' and 'botch'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of blotch
Blotch appeared in English in the early seventeenth century, apparently as an alteration or blend involving 'blot', the older word for a spot or stain. Some lexicographers have suggested influence from 'botch', which would explain both its meaning of a clumsy, irregular mark and its distinctive '-otch' ending. The exact origin remains somewhat uncertain, but the word settled quickly into standard use, first describing disfiguring spots on things like fruit and cloth, later extending naturally to skin. It belongs to a small English family of blunt, monosyllabic words for surface imperfections, alongside 'blot', 'blob', and 'smudge'.
Related word forms
How blotch is actually used
'Blotch' carries a mildly negative connotation, suggesting unsightliness or disease, so it suits descriptive, medical, and horticultural contexts more than formal praise. The adjective 'blotchy' is very common in everyday speech about skin.
Easily confused with blotch
A blot is typically an ink spot or a moral stain, while a blotch is a larger irregular patch of discolouration, often on skin.
A botch is a badly done job or clumsy repair, whereas a blotch is a physical spot or patch of discolouration.