= Solution
\b[Infantile <syphilis>, <varicella>, modified <smallpox> and ordinary <smallpox> are distinguished by the whole illness: age and history, prodrome, distribution, lesion depth, successive crops and the speed of evolution.] No isolated “spot” supplies an infallible diagnosis. <Varioloid> is the historical name for modified <smallpox>, particularly after <vaccination>; it is not a synonym for <varicella>.
In an infant, the relevant <syphilis> is chiefly <congenital syphilis>, transmitted during pregnancy. It can be unapparent at birth and declare itself later with persistent nasal discharge or “snuffles,” poor growth, fissuring near the mouth, a copper-coloured maculopapular or peeling eruption, and lesions on palms and soles. Bullae or pustular appearances can occur. Associated <hepatosplenomegaly>, <jaundice> and painful bone disease support a systemic process rather than a simple crop of transient vesicles. The eruption is not required to pass synchronously through the stereotyped smallpox sequence. Maternal infection and appropriate <serology> matter; absence of a rash at birth does not exclude infection.<Congenital syphilis: 2026 case definition by CDC>[Clinical description in children younger than two years: rhinitis, rash, bone and visceral findings]{ref}<About Congenital Syphilis by CDC>[Signs and symptoms; infants without symptoms at birth]{ref}
<Varicella>, or <chickenpox>, typically produces delicate superficial itchy vesicles on a red base, especially on the <anatomical trunk>, with successive crops. Consequently fresh papules, vesicles and crusts coexist in one area. In children the preceding illness is often mild or absent. Individual lesions evolve quickly, and ordinary superficial lesions usually heal without the deep pitting associated with destructive smallpox lesions, although secondary infection can scar. The distribution is generally centripetal rather than most dense on the distal limbs; palms and soles are much less commonly affected.<Diagnosis and Evaluation of Smallpox by CDC>[Differential diagnosis and diagnostic criteria]{ref}
Ordinary <variola>, or <smallpox>, classically begins with a marked febrile prodrome, often including headache, backache and prostration, before the rash. Lesions favour the face and extremities, can affect palms and soles, and proceed through firm papules to deep-seated vesicles and pustules, often with central depression. Within a given region they are relatively alike in developmental stage. The lesions evolve over days rather than the rapid successive crops of <varicella>; crusting and separation may leave depressed scars. Severe confluent, flat or haemorrhagic forms depart from the uncomplicated textbook pattern, so the absence of perfect pustules is not a universal exclusion.<Evaluating Patients for Smallpox by CDC>[Major and minor criteria; ordinary smallpox rash and comparison with chickenpox]{ref}<Clinical Signs and Symptoms of Smallpox by CDC>[Flat-type and haemorrhagic smallpox]{ref}
<Varioloid> retains the cause of <smallpox> but has a modified course. Prior <vaccination> can yield fewer and more superficial lesions, faster evolution and less secondary fever. The prodrome can still be substantial. Sparse lesions and shortened evolution can resemble <chickenpox>, so vaccination history and the entire time course help, but neither a vaccination scar nor mild disease proves the diagnosis. <Varioloid> and <variola> belong on a spectrum of the same infection, whereas <varicella> is caused by a different <virus>.<Clinical Signs and Symptoms of Smallpox by CDC>[Modified-type smallpox: prodrome, fewer superficial lesions and more rapid crusting]{ref}
Thus the characteristic contrast is persistent multisystem infantile infection for <congenital syphilis>, superficial lesions in mixed-stage crops for <varicella>, deeper regionally synchronous lesions with a severe preceding fever for ordinary <smallpox>, and attenuation of the latter pattern for <varioloid>. Current confirmation uses tests appropriate to the suspected organism; the historical clinical distinctions remain valuable descriptions, but they do not replace modern laboratory confirmation.
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