Can hand, foot, and mouth disease produce lesions on the arms and face?

Can Hand, Foot, and Mouth Disease Produce Lesions on the Arms and Face?

Yes, hand, foot, and mouth disease frequently involves the arms and face, particularly in atypical presentations associated with coxsackievirus A6, which now accounts for the majority of HFMD cases. 1

Classic vs. Atypical Distribution Patterns

Traditional HFMD Presentation

• Classic HFMD was historically limited to vesicular lesions on the palms, soles, and oral mucosa, with occasional buttock involvement 2
• This pattern was most commonly associated with coxsackievirus A16 and enterovirus 71 infections 3

Modern Atypical Presentations (Now the Majority)

• In a systematic review of 1,359 pediatric cases, atypical sites were extremely common: arms and/or legs in 47% of cases and face in 45% of cases 1
• The trunk was involved in 27% of atypical HFMD cases 1
• Coxsackievirus A6 was identified in 63% of these atypical presentations and is now the predominant circulating strain 1

Specific Facial and Arm Involvement Patterns

Facial Distribution

• Perioral rash is strongly associated with coxsackievirus A6 infection (P < 0.001) 2
• Rashes on earlobes and faces have been documented in prospective cohort studies 4
• In neonates, maculopapular rashes commonly involve the face, trunk, breech, arms, and legs 5

Arm and Leg Involvement

• Widespread vesicular exanthema involving five or more anatomical sites (hands, feet, mouth, buttocks, legs, arms, and trunk) occurred in 41.5% of confirmed HFMD cases 2
• Large vesicles or bullae can appear on bilateral limbs, not just the traditional palmar/plantar distribution 4

Morphologic Variations That May Appear on Arms and Face

• The most common morphologies in atypical HFMD are vesicles (53%), papules (49%), and bullae (36%) 1
• Eczema herpeticum-like lesions occur in 19% of atypical cases 1
• Purpuric/petechial patterns are seen in 7% of cases 1
• Gianotti-Crosti-like eruptions (papular acrodermatitis pattern) occur in 4% 1

Critical Diagnostic Pitfalls to Avoid

Misdiagnosis Risk

• Due to unusual morphologies and widespread distribution, atypical HFMD is frequently misdiagnosed as eczema herpeticum, varicella, disseminated zoster, or erythema multiforme major 6
• This misdiagnosis leads to inappropriate hospitalization, unnecessary investigations (including lumbar puncture when meningitis is suspected), and treatment with acyclovir or intravenous antibiotics 1, 5

Key Distinguishing Features

• Unlike varicella (chickenpox), HFMD lesions—even when widespread—tend to concentrate on acral sites (hands, feet) in addition to other areas, whereas varicella has a more random centripetal distribution 7
• The presence of oral ulcers or vesicles alongside skin lesions strongly supports HFMD over other vesiculobullous diseases 8
• Fever is typically the first symptom, followed 1-2 days later by the rash, which helps distinguish HFMD from drug reactions 7

Expected Clinical Course

• Symptoms resolve in a mean of 10 days without specific antiviral therapy 1
• The most common delayed complications are nail changes (onychomadesis) in 21% of cases occurring approximately 3 weeks after symptom onset, and desquamation in 4% occurring around 2 weeks later 1
• HFMD is self-limited; once bacterial infection is ruled out, antibiotics should be avoided 5

When to Suspect Atypical HFMD

• Any child presenting with fever and vesicular or papular rash involving the face, arms, or trunk—especially if accompanied by oral lesions—should be evaluated for atypical HFMD 1, 2
• Recent reports show an increase in atypical presentations, making widespread distribution the new norm rather than the exception 9, 3
• The mean age of affected children is 2.4 years with a male predominance (61%), though neonates can also be affected 1, 5

Management Implications

• Recognition of atypical distribution patterns prevents unnecessary acyclovir administration (which was given in 16% of cases in one systematic review despite being ineffective against enteroviruses) 1
• Proper diagnosis allows appropriate counseling on infection control precautions, as enteroviruses are highly contagious through respiratory secretions and fecal-oral transmission 8
• Parents should be counseled about the possibility of delayed nail changes occurring 2-4 weeks after resolution of the acute illness 1