Rule 139...
Rule 139: With regard to the ceremonies involved, the two optional pilgrimages, Mufradah and Tamatoo closely resemble with a few differences which are : (1) in Umrat-ul-Mufradah, it is obligatory to perform Tawaf ul-Nisa but it is not obligatory in Umrat-ul-Tamatoo; (2) Umrat-ul-Tamatoo can only be performed during the season of the obligatory pilgrimage, namely, Shawaal, Dhil Qa'dah and Dhil Hijjah while it is permissible to perform the Umrat-uI-Mufradah during all the months of the year, preferably in Rajab; (3) in Umrat-ul-Tamatoo, the ihram can be removed only after Taqseer, while in Umrat-ul-Mufradah it can be removed after taqseer or shaving the head; (4) it is obligatory to perform Umrat-ul-Tamatoo and the obligatory pilgrimage in the same year but that is not the rule for Umrat-ul-Mufradah.
If Hajj-ul-Ifraad and Umrat-ul-Ifraad have become obligatory on a person, it is permissible for him to perform the Hajj-ul-Ifraad in one year and the Umrat-ul-Ifraad in the other year; (5) in Umrat-ul-Mufradah, if a person deliberately indulges in sexual intercourse before Saee, his pilgrimage becomes invalidated and he becomes obliged to perform the pilgrimage again, that is to stay in Makkah to the following month to perform it.
However, if he does so during Umrat-ul-Tamatoo it is doubtful if it would be invalidated and the better view is that it will not be affected as will appear below.
Rule 140: In Umrat-ul-Mufradah as in Umrat-ul-Tamatoo one must wear ihram at the Meeqaat itself as will be explained below and if the person is in Makkah and intends to perform an Umrat-ul-Mufradah, it is permissible for him to come out of the Haram and wear his ihram and it is not obligatory for him to proceed to a Meeqaat and wear the ihram there and it is permissible for him to wear the ihram at Hudaybiyyah or Je'aranah or Tan'eem.
the only exception to this rule is when a person invalidates his Umrat-ul-Mufradah by having sexual intercourse with his wife before saee. In this case, as a matter of precaution, he must repeat the ihram for a new umrah from a meeqaat and it is not permissible to wear ihram in such a case from Tan'eem.
Rule 141: It is obligatory to perform an Umrat-ul-Mufradah if one intends to enter Makkah, for it is not permissible to enter the city without ihram except for those who enter and depart from there regularly like the woodcutter or grasscutter.