Neurofibromatosis:this the growing of tumour on the skin thereby disfiguring the carrier.it is caused by the contamination of the neurone canal&nervous system.

add urz.

My broda no be by big name alone o, am a doctor and disease I fear most now is lassa fever, it spreads like air freshner, kills d patient plus relatives + caregiver. Lassa fever belongs to a group of viral haemorrhagic fever, the source of infection is tot to be from house rat, wen they contaminate food subs with their faeces, urine or foot. First discoverd ia lassa village of Nigeria now its rampant in other places like abakaliki ,ebonyi

LEPROSY: One of the oldest diseases of the time of jesus christ.it is a communicable disease.and makes the carier lose his/her ability to socialize.

@OP I will add mine but only after you have changed the title of your post. An English language expression can not have 2superlatives beside each other 'most scariest'.