## Most Common Cause of Tinea Manuum in India **Key Point:** *Trichophyton rubrum* is the most common causative organism of tinea manuum (hand tinea) globally and in India, accounting for approximately 60–70% of cases. ### Epidemiology of Tinea Manuum Organisms | Organism | Prevalence | Geographic Pattern | Clinical Features | |----------|-----------|-------------------|------------------| | **T. rubrum** | **60–70%** | **Worldwide, including India** | **Chronic, dry, hyperkeratotic** | | E. floccosum | 20–30% | Tropical regions | Interdigital maceration, acute | | T. mentagrophytes | 5–10% | Less common in India | Inflammatory, vesicular | | M. canis | Rare | Zoonotic | Animal contact history | ### Why T. rubrum Dominates 1. **Anthropophilic organism** — prefers human skin; spreads easily through person-to-person contact 2. **Chronic colonization** — establishes persistent infection with slow progression 3. **Adaptation to Indian climate** — thrives in warm, humid environments 4. **Resistance to treatment** — more difficult to eradicate, leading to higher prevalence in endemic areas **Mnemonic:** **T-RUB** = **T. rubrum** is the **RUB**ber-stamp answer for tinea manuum — the most common cause worldwide. **Clinical Pearl:** T. rubrum typically presents as a chronic, dry, hyperkeratotic infection ("moccasin type"), whereas E. floccosum causes acute interdigital maceration ("wet type"). T. rubrum's chronicity makes it more prevalent in clinical practice. **High-Yield:** In NEET PG, when asked about the most common cause of tinea manuum, always choose **T. rubrum**. This is tested repeatedly and is the single best answer. [cite:Irvine Dermatology Ch 8]
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