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Hi and thanks for the query.
Spontaneous bruising is not uncommon especially in this setting where someone has been hospitalized. The bruising can result from electrolyte imbalances, IV fluid excess, trivial trauma that went unnoticed, cellulitis etc. Since, there is pain, I would suggest that you have this looked at. Usually, this is just due to spontaenous rupture of superficial venules but in those cases pain is rare. Although this bruise follows the region of the basilic vein and phlebitis (inflammation of the vein) is a possibility but an examination is vital to delineate and define this.
Tenderness and pain are an accompaniment of cellulitis and inflammation.
Let me know if you need more information.
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