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.priceBox {
    display: block;
    text-align: right;
    @include fontsize(25);
    &:before {
        margin-right: 3px;
        content: '\FFE5';
        @include fontsize(15);
    }
    &:after {
        margin-left: 1px;
        content: '\FF08\7A0E\629C\FF09'; //税抜
        //content: '\FF08\7A0E\8FBC\FF09'; 税込
        @include fontsize(15);
    }
}

<span class="priceBox">3,990</span>