Here’s why this is urgent and what it could potentially be (so you can better inform the doctor):
Reasons This Needs a Doctor NOW:
-
Inability to Move the Foot: This indicates the problem is affecting more than just the skin's surface—it could involve tendons, joints, nerves, or deep tissue. This is not typical for a simple superficial blister.
-
Severe Pain: Significant pain points to inflammation, infection, or pressure on nerves.
-
Rapid Onset & Large Size: A lesion that appears overnight and is "huge" needs professional evaluation to rule out serious causes.
Possible Causes a Doctor Will Investigate:
-
-
Severe Infection (Cellulitis/Abscess): A deep skin infection can cause a red, swollen, painful, and blistering area. The inability to move the foot is a classic sign that the infection may be spreading into deeper tissues. This is a medical emergency.
-
-
-
Trauma (Crush Injury): She may have injured her foot without realizing it (e.g., dropping something on it, a heavy door closing on it). This can cause deep bleeding under the skin that appears as a large, dark blister.
-
Blood Blister from Ill-Fitting Shoes: This is the most common cause, but the severe pain and immobility make a simple blister less likely. If it is a blister, it may be very deep or infected.
continue to the next page
-
