.severe Red Swollen Rash On Abdomen And 2 Other Areas

.severe red swollen rash on abdomen and 2 other areas under breast and small line of red where bra lies on skin.

It itches, stings, burns and now pain starting to set in. I have had these symptoms for last 26 hours.

I thought maybe either contact dermatitis, flea bites, cat allergy, or food allergy.

Please let me know your thoughts.
Thank you.