The ringworm that is not painful and itchy in a circle-like manner includes lichen planus, pityriasis rosea, and second-stage syphilis.
1. lichen planus: lichen planus, also known as lichen planus furfur, is mainly caused by malassezia invasion of the skin stratum corneum of superficial infection, the initial stage is centered on the pores, the border is clear point-like rash, and then the rash gradually increased to the size of the fingernail cap, can be round or round-like, usually no conscious symptoms.
2. pityriasis rosea: pityriasis rosea is an inflammatory dermatosis, occurring on the trunk and proximal limbs, lesions are mostly covered with furfuraceous scales of rose-colored macules, macules, in a circle, most patients do not have any obvious symptoms, a few patients with mild itching symptoms.
3. Second-stage syphilis: due to the infection of syphilis spirochetes, often manifested as a generalized round or oval reddish blotchy rash, papules and other manifestations, generally no conscious symptoms.
It is recommended that patients seek medical examination in a timely manner to clarify the cause of the targeted treatment, pay attention to observe the affected area in life, if there is any abnormality in a timely manner to consult a doctor.