Ene dro yewetabegn yeneberew yehone xentle yemibal be 4 wer ande mnamn mewesdew sherop nbr , be doctor prescription sayhon endihu pharmacy wst le hod Hemem teblo migeza ena esun kalwesedku wey dmo yaltetara weha ketetaw nbr....... ena I think it has something to do with bacteria or whatnot idk..... so keep your personal hygiene...... and also avoid exposure to sun + weha bedemb techi beterefe berasu giza yetefal