mastocytoma

synonym: mast cell tumor
https://doi.org/10.1351/goldbook.13445
Nodule of mast cells that can involve the skin, subcutaneous tissue, and sometimes muscle.
Note: Mastocytomas are rare and are mostly seen in infants within the first three months of life.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1211 [Terms] [Paper]