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Could you attach a picture of these black dots, preferably a close-up or a high resolution image that allows for zooming?
These spots are due to small amounts of bleeding into the skin, called petechiae.
It is not common for petechiae to occur because of contact with salt water They can occur from a variety of causes. Exertion or minor trauma could be a contributing factor, so activities that were done while entering the salt water may be more of a role than the contact with the salt water, itself. They also can occur from a reaction to medicine, but it would be more of a concern if a new medicine is being used, including aspirin for a headache. Certain medical conditions also could be an issue for persistent symptoms.
If these spots resolve and do not recur, then there is no need for further evaluation. However, if the spots are persistent or recurrent, then it would be appropriate to see your doctor for an evaluation.
Aspirin works by inhibiting platelets, and one of the possible side effects of inhibiting platelets is the small bleeding into the skin. Aspirin is one of the most common medicines that can cause this problem. The aspirin can cause petechiae directly and it also can predispose someone to developing petechiae from exertion or minor trauma. If petechiae happen from another cause, then it can also make the problem worse and slower to resolve.
However, since the aspirin was recently started, it would be most suspicious that this is due to the aspirin. You do not say why the aspirin was started, but if it was a general prophylactic, it may be better to stop the aspirin until the spots resolve.
Most infections that can be acquired from salt water exposure of the beach would enter the foot through an open wound. This also does not look like the changes that would occur with parasites.
The primary infection that would be a concern is not a parasite, but a bacteria, called Vibrio. This infection also is typically acquired via a foot wound, and can cause secondary infection of the wound. The spots that you are experiencing is not what is seen with Vibrio.
These spots are not worrisome for Vibrio.
Correct, this is not a flesh eating infection, primarily because of the appearance, but it is also true that the presence on both feet would suggest that it is not such an infection.
It may take several days for the spots to resolve and the spots may get worse initially, particularly since the aspirin effect is still in your system, even if you do not take another pill for a while. However. the spots are persistent, it would be appropriate to see your doctor.
If they do not resolve spontaneously.
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