3 doctors weighed in:

How long should a bruise or knot at an immunization injection site last for?

3 doctors weighed in
Dr. Thomas Deberardino
Orthopedic Surgery
1 doctor agrees

In brief: Several days perhaps

A local bruise or hematoma and swelling are not uncommon near injection sites.
A small vessel (vein) was likely traversed by the needle upon tissue penetration. The best indicator of resolution is decreasing pain, swelling and fading of dark discoloration from black, purple, and blue, to brown and yellow.

In brief: Several days perhaps

A local bruise or hematoma and swelling are not uncommon near injection sites.
A small vessel (vein) was likely traversed by the needle upon tissue penetration. The best indicator of resolution is decreasing pain, swelling and fading of dark discoloration from black, purple, and blue, to brown and yellow.
Dr. Thomas Deberardino
Dr. Thomas Deberardino
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Dr. Mark Diamond
Pediatrics

In brief: Varies

Usually a few days.Rarely for several weeks.

In brief: Varies

Usually a few days.Rarely for several weeks.
Dr. Mark Diamond
Dr. Mark Diamond
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