Single most likely diagnosis:
- Insect bite (e.g., mosquito, ant, or flea bite) - This is the most common and likely diagnosis, given the prevalence of insect bites and the fact that most are not venomous.
Other Likely diagnoses:
- Non-venomous spider bite - While most spider bites are not venomous, they can still cause discomfort and are a common occurrence.
- Minor animal bite (e.g., dog, cat) - These bites can be painful but are often not venomous.
- Skin irritation or allergic reaction - Sometimes, skin reactions can be mistaken for bites.
Do Not Miss diagnoses:
- Snake bite (e.g., venomous snake like a rattlesnake, copperhead) - Although less likely, a venomous snake bite can be deadly and requires immediate medical attention.
- Black widow spider bite - The venom from a black widow spider can cause severe symptoms and is potentially life-threatening.
- Brown recluse spider bite - The venom from this spider can cause necrotic lesions and other serious health issues.
Rare diagnoses:
- Scorpion sting - While rare in many areas, scorpion stings can be venomous and potentially deadly.
- Tick bite with tick-borne illness (e.g., Lyme disease) - Although not immediately venomous, tick bites can transmit serious diseases.
- Exotic venomous animal bite (e.g., venomous lizard, frog) - These are extremely rare but can be deadly if not properly treated.