Fever, diarrhea, rashes, warts
Reading File
Asking for Preferences
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Searching the Web
differential diagnosis fever diarrhea rash warts adult
Reading File
Reading File
Reading File
Finding Sources
I now have rich information from Harrison's 22nd edition. Let me compile the differential diagnosis.
Differential Diagnosis: Fever + Diarrhea + Rash + Warts (Adult)
This combination in an adult is a clinically significant constellation that points toward a systemic or immunodeficiency-related process rather than isolated conditions. Here is a structured differential:
🔴 Top Priority: HIV/AIDS
The combination of fever, diarrhea, rash, and warts in an adult is the classic presentation of HIV infection / AIDS.
| Stage | Features |
|---|---|
| Primary (Acute) HIV | Fever, maculopapular rash (trunk), diarrhea, pharyngitis, lymphadenopathy — resembles mononucleosis |
| Advanced HIV / AIDS | Chronic diarrhea (Cryptosporidium, CMV, MAC), recurrent/extensive warts (HPV — condylomata, verruca), mucocutaneous rashes, oral hairy leukoplakia |
Warts (HPV-related) become extensive and recalcitrant as CD4 counts fall. Diarrhea in AIDS is often caused by opportunistic organisms (Cryptosporidium, Isospora, Giardia, CMV colitis). — Harrison's Principles of Internal Medicine, 22E
🟠 Secondary Syphilis
The great imitator. Secondary syphilis classically presents with:
- Fever, malaise, headache
- Diffuse maculopapular rash (trunk, palms, soles — key feature)
- Condylomata lata (flat, moist wart-like lesions in anogenital/intertriginous areas — distinct from HPV warts but easily confused)
- Diarrhea / GI involvement in some cases
- Lymphadenopathy, mucous patches
Harrison's 22E notes secondary syphilis in the centrally distributed maculopapular eruptions table with widespread mucocutaneous involvement.
🟡 Viral Exanthems with GI Features
| Condition | Rash Type | Diarrhea | Warts/Papules |
|---|---|---|---|
| Measles (Rubeola) | Maculopapular, cephalocaudal spread, Koplik's spots | Common | No |
| Enteroviruses (Coxsackie/Echo) | Maculopapular or vesicular | Yes (prominent) | No |
| Hand-Foot-Mouth Disease | Vesicles on hands, feet, mouth | Common | No |
| Dengue | Maculopapular, "islands of white" in sea of red | Common | No |
| EBV (Mono) | Maculopapular (especially post-amoxicillin) | Occasional | No |
🟡 Reactive Arthritis (Reiter Syndrome)
Triad: urethritis + arthritis + conjunctivitis, but skin/mucosal lesions include:
- Keratoderma blennorrhagica (hyperkeratotic, wart-like papules on palms/soles)
- Circinate balanitis
- Fever, diarrhea (post-enteric trigger: Salmonella, Shigella, Campylobacter, Yersinia)
The wart-like skin lesions can directly mimic HPV warts.
🟢 Other Considerations
| Condition | Notes |
|---|---|
| Molluscum contagiosum | Can be disseminated and extensive in immunocompromised adults; umbilicated papules may resemble warts |
| Drug reaction (DRESS syndrome) | Fever + widespread rash + visceral involvement (diarrhea); no warts |
| Rocky Mountain Spotted Fever / Rickettsial | Fever, petechial/purpuric rash, can have GI symptoms; no warts |
| Systemic Lupus (SLE) | Butterfly rash, fever, serositis; diarrhea in GI lupus |
| Disseminated HSV | Fever, vesicular lesions, can cause esophagitis/diarrhea in immunocompromised |
Clinical Approach
Given this symptom cluster in an adult, the first investigation should be:
- HIV serology (4th-gen Ag/Ab combo) — highest yield for this exact combination
- RPR/VDRL + FTA-ABS — rule out secondary syphilis
- CBC with differential — lymphopenia suggests HIV; eosinophilia suggests drug reaction
- Stool studies — culture, ova & parasites, C. difficile
- STI screen — gonorrhea, chlamydia, hepatitis B/C
- Skin biopsy of rash if diagnosis unclear
- CD4 count + HIV viral load if HIV confirmed
Key discriminator: The presence of warts is the feature that most strongly pushes toward an immunodeficiency state (HIV, organ transplant immunosuppression, or primary immunodeficiency). In an otherwise immunocompetent adult, true warts don't typically accompany acute systemic illness. Condylomata lata of syphilis or keratoderma blennorrhagica of reactive arthritis are the main non-HIV mimics.
— Harrison's Principles of Internal Medicine, 22E, Chapter 21: Fever and Rash; Goldman-Cecil Medicine, Table 259-2: Causes of Fever and Rash by Rash Morphology
This is a shared conversation. Sign in to Orris to start your own chat.